Tests for the Independence Between Two Seemingly Unrelated Regression Equations
两个似不相关回归方程之间的独立性检验AI 解读 ↓
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When the error terms in two different regression equations are correlated, Zellner proposed an alternative estimator for the coefficients of each equation based on an estimated covariance matrix between the two error terms. However, since an estimated covariance matrix is used, the OLSE seems better than Zellner's estimator when the correlation of the two equations is close enough to zero. This paper considers the problem of testing the independence between two regression equations and derives a locally best invariant test for a one-sided alternative hypothesis and a locally best unbiased and invariant test for a two-sided alternative.